186 CONTRIBUTIONS FROM THE NATIONAL EEKBARIUM. 



Virginia: Virginia Beach, Bradford in 1900. Smiths Island, Palmer in J897. 



North Carolina: Wilmington, Hitchcock in 1905. 



South Carolina: Bluffton, Mellichamp in 1883. 



Georgia: Experiment, Redding in 1895. 



Florida: Alachua, Combs 748. Grasmere, Combs 1054. Homosassa, Combs 964. 



Merritts Island, Curtiss 3618. Okeechobee region, Fredholm, 6178. Palm Beach, 



Curtiss 5410. Eustis, Nash 1279. Clarcona, Meislahn 76. Manatee, Rugel 365. 



St. Vincent Island, Pierce in 1911; McAtee 1713A. Dania, Eaton 828. Apopka, 



Baker in 1897 and 1898. Bartow, Combs 1219. Deland, Hill in 1899. 

 Alabama: Mobile, Mohr in 1869. 

 Louisiana: Lake Charles, Allison 110. Pointe a la Hache, Langlois 56. Burton 



Island, Tracy & Lloyd 463. New Orleans, Fisher 133; Biltmore Herb. 3459a. 



Houma, Wurzlow in 1913. 

 Texas: Galveston, Tracy 7747. "Western Texas to El Paso," Wright 801. Eagle 



Lake, Flank in 1891. 

 ■Costa Rica: Boca Zacate, Pittier 6825. Punta Mala, Tonduz 6825. 

 Bermuda: Munro in 1864. (This locality is doubtful as the species is not known to 



grow in Bermuda now.) 

 Jamaica: Black River, Hitchcock 9646. Ferry River, Purdie (in Grisebach Herb.). 

 Porto Rico: Campo Alegre, Chase 6800. Without locality, Eggers 709. 

 Leeward Islands: Guadeloupe, Duss 3918. 



13. Chaetochloa ambigua (Guss.) Scribn. & Merr. 



Panicum verticillatum /3 ambiguum Guss. Fl. Sic. Prodr. 80. 1827. Sicily. 



Setaria ambigua Guss. Fl. Sic. Syn. 1: 114. 1842. Based on Panicum verticillatum 

 j3 ambiguum Guss. 



Setaria verticillata var. ambigua Pari. Fl. Palerm. 1: 36. 1845. Based on Panicum 

 verticillatum j3 ambiguum Guss. 



Panicum ambiguum Hausskn. Oesterr. Bot. Zeitschr. 25: 345. 1875. Based on 

 Setaria ambigua Guss. 



Chamaeraphis italica var. ambigua Kuntze, Rev. Gen. PI. 2: 768. 1891. Based on 

 ■"Panicum ambiguum Guss." 



Chaetochloa ambigua Scribn. & Merr. U. S. Dept. Agr. Div. Agrost. Bull. 21: 18./. 7. 

 1900. Based on Setaria verticillata var. ambigua Guss. 



A complete synonymy is given by Hubbard. 1 



description. 



Plants with the aspect of Chaetochloa verticillata, differing in the longer ligule, sca- 

 brous but not pilose blades, and the antrorsely scabrous bristles. The bristles are 

 mostly 2 to 3 times as long as the spikelets and at maturity are spreading and more or 

 less implicate. 



This may be only a variety of Chaetochloa verticillata or of C. viridis, between which 

 it seems to be intermediate. It is retained as a species because it can not be deOnitely 

 referred to either of the two species mentioned. 



DISTRIBUTION. 



Central and southern Europe; sparingly introduced in the United States. 

 Pennsylvania: Ballast ground near Philadelphia, Scribner in 1884. 

 District op Columbia: A weed in the grass garden, Merrill, Sept. 20, 1900; Merrill 



175, July 30, 1900. 

 Alabama: Waste places, Mobile, Mohr in 1884. 



1 Amer. Journ. Bot. 2: 179. 1915. 



